* feat: GCP authentication
Add authentication support for:
- authentication with service account key
- authentication with impersonating service account key
- authentication with application default credentials which are read from the environment
A HTTP client with a token set will be returned and used for authentication with all clients. for example
```
gcpClient, err := gcpConfig.GetClient(ctx)
if err != nil {
log.Fatalf("Failed to get client: %v", err)
}
client, err := computeCloud.NewInstancesRESTClient(ctx, option.WithHTTPClient(gcpClient))
if err != nil {
log.Fatalf("Failed to create client: %v", err)
}
```
add support for google host attributes:
- project_id (Required): The project ID associated with the service account
- zone (Required): The deployment area within a region
disable_credential_rotation (Optional): Disables credential rotation by the plugin
- client_email (Optional): The email address associated with the service account. The email address used to uniquely identify the service account. It is required for authentication and authorization. If it is not set, authentication will fail.
- target_service_account_id (Optional): The unique identifier for the service account that will be impersonated.
- disable_credential_rotation (Optional): Disable the rotation of google service account key associated with the plugin
Elim Tsiagbey
Rosemary Wang
Louis Ruch